To give you some real numbers, I ran some Zero 240 grain JSP bullets across my chrono loaded with 9.0 grains of Unique with CCI-300 primers a few years ago. These were shot out of my 6 1/2" barrel 629-3 Classic. The data is as follows:

Average velocity - 866 ft/sec
ES - 46 ft/sec
SD - 18 ft/sec
Temperature - 78* F

If I were loading up for hunting with those XTP bullets, I would load closer to 10 grains of Unique and maybe even a little higher.